{
  "guide": "install-google-tag-gtag",
  "checked": "2026-11-11",
  "snippet": {
    "starts_with": "<!-- Global tag (gtag.js) -->",
    "ends_with": "</script>",
    "script_blocks": 2,
    "block_1": "loads gtag.js with the Measurement ID in the source address",
    "block_2": "defines gtag(), stamps the load time, calls gtag('config', 'G-XXXXXXXXXX')"
  },
  "placement": "immediately after the opening <head> tag, on every page",
  "config_call": {
    "sends": "page_view automatically",
    "add_second_page_view": false
  },
  "location": "Admin > Data streams > stream name > Google tag section > View tag instructions > Install manually",
  "role_required": "Editor or above at the property level",
  "verification": {
    "realtime": "within minutes",
    "standard_reports_hours": [
      24,
      48
    ],
    "lag_window_hours": 24,
    "recomputed": "48 - 24 = 24"
  },
  "rule": "Google tag or Tag Manager, not both"
}